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Butterfly Valve in intake manifold

Old 01-14-2019, 04:38 AM
  #1  
Heater Guy
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Default Butterfly Valve in intake manifold

My 2008 Cayman 2.4 L track car's intake has a vacuum controlled butterfly valve in the back cross tube of the intake manifold.

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What is the purpose of this valve?? It is acuated by an electrically controlled vacuum solenoid. Can someone explain it?

Any reason why I can't remove it and tell the computer to ignore the code?


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Old 01-14-2019, 01:17 PM
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So you're posting in the air cooled 911 specific forum, and you may get a more accurate answer if you re post in a cayman specific area. That said; It looks like a resonance flap, that would be used for changing the volume of the intake manifold for different parts of the RPM range. The 964 engine has something very similar. The change in intake volume changes the resonance created within the manifold that is used to increase cylinder filling. If you lock it in one position you will be very sad with the result. You will either lose somewhere near 10% torque in the low end, or take a big whack off the top end power. If you do some searches you can find dyno sheets where 964 owners or shops have locked them out to show the measured effects.
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